US3880367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grain mill
Assignee: SUNCREST PRODUCTS Inc
•
Filing: 1973-09-14
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Granted: 1975-04-29
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Expires: 1993-09-14
Abstract
Abstract A small compact mill for grinding wheat and other grains comprises annular grinding stones, one fixed and the other driven, each secured to steel cutting burrs which have their cutting edges substantially in the grinding plane and one of which receives grain through a central opening in the burrs. The grain is cut or chopped by secant or non-radial cutter elements closely facing each other and set for shearing action. These force the grain as it is cut radially outward between annular grinding stones which are secured respectively to the stationary and the driven rotary burr. The driven burr is directly connected to the drive shaft of the motor, the motor being provided with a thrust bearing to oppose the thrust between the chopping and grinding elements. A hopper above the stones supplies the feed and includes a removable bottom sealed to the sides, and is provided with a metering opening to feed grain at controlled rate into a feed channel connected with the inlet through the stationary burr.
Inventors
- 👤 Herman Jack Grover
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:52
CPC Classifications
B; B02; B02C; B02C7/00; B02C7/18; B02C7/11; B02C7/12; B02C7/13; B02C9/00; B02C9/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
208 words
In apparatus of the character described for grinding or comminuting grain and the like, the combination which comprises a pair of mutually facing and respectively rotatable and relatively fixed grinding and comminuting elements adapted to cooperate at a grinding plane or interface, each of said elements comprising a centrally located circular cutting burr having cutting edges extending at a small angle with respect to a radius of the burr and adapted to lie substantially in said plane, said cutting edges being so directed as to tend to impel the material being ground or comminuted radially outward in said plane, each of said elements comprising also an annular abrasive grinding stone surrounding said burr and having its grinding surface arranged to lie substantially flat in said plane to receive cut material from the burr and grind said material between said grinding surfaces, said rotatable element being fixed to a driving shaft, said relatively fixed element being supported on a backing member which is axially movable with respect to said plane, resilient means for urging said backing member and relatively fixed element towards the plane, and adjustable means for resisting said resilient means, thereby to control the relative position of the relatively fixed element with respect to the rotatable element.
Claim 2
Dependent Claim
208 words
In apparatus of the character described for grinding or comminuting grain and the like, the combination which comprises a pair of mutually facing and respectively rotatable and relatively fixed grinding and comminuting elements adapted to cooperate at a grinding plane or interface, each of said elements comprising a centrally located circular cutting burr having cutting edges extending at a small angle with respect to a radius of the burr and adapted to lie substantially in said plane, said cutting edges being so directed as to tend to impel the material being ground or comminuted radially outward in said plane, each of said elements comprising also an annular abrasive grinding stone surrounding said burr and having its grinding surface arranged to lie substantially flat in said plane to receive cut material from the burr and grind said material between said grinding surfaces, said rotatable element being fixed to a driving shaft, said relatively fixed element being supported on a backing member which is axially movable with respect to said plane, resilient means for urging said backing member and relatively fixed element towards the plane, and adjustable means for resisting said resilient means, thereby to control the relative position of the relatively fixed element with respect to the rotatable element.
Claim 3
Dependent Claim
36 words
Apparatus according to claim 1 which includes metering means for feeding grain to said stones at a predetermined rate, and thrust bearing means in the drive motor for resisting the grinding thrust between the grinding surfaces.
Claim 4
Dependent Claim
26 words
A mill apparatus according to claim 1 which includes a dust-sealed feed compartment above the grinding elements and a dust-sealed flour receiving bin below said elements.
Claim 5
Dependent Claim
43 words
Apparatus according to claim 1 in which the metal cutting or grain chopping elements in the burrs of grinding elements cross each other with shear-like action at a small angle effective to propel the grain particles radially outward, thus to enhance shearing action.
Claim 6
Dependent Claim
15 words
Apparatus according to claim 1 wherein the adjustable means consist of a single adjusting screw.
Claim 7
Dependent Claim
39 words
Apparatus according to claim 1 wherein the burr cutting elements each make an angle of 8 to 12* with respect to a radius of the burr, said elements being so directed as to impel the feed material radially outward.
Claim 8
Dependent Claim
39 words
Apparatus according to claim 1 wherein each of the annular grinding stones includes non-radial slots each making an angle of between 10 and 25* with a stone radius and in a direction to impel the feed material radially outward.
Claim 9
Dependent Claim
27 words
Apparatus according to claim 7 in which the nonradial slots in the stones are each arranged substantially in line with an advance cutting edge of the burrs.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |